EP0817172A1 - Matrix-Magnetkopf zur Aufzeichnung/Wiedergabe und Herstellungsverfahren - Google Patents

Matrix-Magnetkopf zur Aufzeichnung/Wiedergabe und Herstellungsverfahren Download PDF

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Publication number
EP0817172A1
EP0817172A1 EP97401601A EP97401601A EP0817172A1 EP 0817172 A1 EP0817172 A1 EP 0817172A1 EP 97401601 A EP97401601 A EP 97401601A EP 97401601 A EP97401601 A EP 97401601A EP 0817172 A1 EP0817172 A1 EP 0817172A1
Authority
EP
European Patent Office
Prior art keywords
layer
substrate
magnetic
face
conductors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97401601A
Other languages
English (en)
French (fr)
Other versions
EP0817172B1 (de
Inventor
Christian Maillot
Marc Dorel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0817172A1 publication Critical patent/EP0817172A1/de
Application granted granted Critical
Publication of EP0817172B1 publication Critical patent/EP0817172B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
    • G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
    • G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
    • G11B5/3945—Heads comprising more than one sensitive element
    • G11B5/3948—Heads comprising more than one sensitive element the sensitive elements being active read-out elements
    • G11B5/3958—Heads comprising more than one sensitive element the sensitive elements being active read-out elements the active elements being arranged in a single plane, e.g. "matrix" disposition
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/49—Fixed mounting or arrangements, e.g. one head per track
    • G11B5/4969—Details for track selection or addressing
    • G11B5/4976—Disposition of heads, e.g. matrix arrangement
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3163—Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3176—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps
    • G11B5/3179—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps the films being mainly disposed in parallel planes
    • G11B5/3183—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps the films being mainly disposed in parallel planes intersecting the gap plane, e.g. "horizontal head structure"
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/488—Disposition of heads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49021—Magnetic recording reproducing transducer [e.g., tape head, core, etc.]
    • Y10T29/49032—Fabricating head structure or component thereof
    • Y10T29/49036—Fabricating head structure or component thereof including measuring or testing
    • Y10T29/49043—Depositing magnetic layer or coating
    • Y10T29/49044—Plural magnetic deposition layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49021—Magnetic recording reproducing transducer [e.g., tape head, core, etc.]
    • Y10T29/49032—Fabricating head structure or component thereof
    • Y10T29/4906—Providing winding
    • Y10T29/49062—Multilayered winding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49021—Magnetic recording reproducing transducer [e.g., tape head, core, etc.]
    • Y10T29/49032—Fabricating head structure or component thereof
    • Y10T29/4906—Providing winding
    • Y10T29/49064—Providing winding by coating

Definitions

  • the invention relates to a matrix magnetic head. recording / playback applicable in particular to the recording / playback of multitrack magnetic tapes.
  • These matrix heads can be produced by technologies hybrids that combine sawing, winding, gluing and depositing steps thin layers. Embodiments are described for example in the French Patent No. 2,648,940. Furthermore, these matrix heads can be realized by so-called "integrated" technologies, completely coated thin. In this case, the conductors are no longer wound wires but etched conductive films. A number of patents describe this type of production.
  • the invention provides a solution to this problem.
  • a SU substrate plate made of insulating material is covered on a su2 face of a layer of a material with good magnetic permeability MAG.
  • This layer carries a first series of conductors L1, L2 (line conductors) and a second series of conductors C1, C2 (column conductors). Line conductors are not parallel to the column conductors and are separated by a layer of insulation IS1.
  • the line conductors are parallel to each other and the column conductors are parallel between them.
  • MAG layer If the MAG layer is conductive, a layer of IS2 insulation insulates it row and column conductors.
  • Line and column conductors form dots crossing.
  • a pair of poles is provided at each crossing point magnetic P1, P2.
  • Two poles P1, P2 are separated by an air gap E1.
  • the two poles are arranged so as to be oriented substantially according to a line passing over the crossing point.
  • the two poles are coupled to the MAG layer in two substantially symmetrical zones by relative to the crossing point.
  • the poles P1, P2 are in contact with the MAG layer by means of magnetic pads PM1, PM2.
  • the magnetic circuit of an elementary magnetic head is thus consisting of two poles P1, P2 separated by the air gap E1, of the two studs PM1, PM2 and the MAG layer.
  • the passage of an electric current in one, the other or both row and column conductors will therefore induce the circulation of magnetic fluxes in the magnetic circuit. In the direction currents in the two conductors, the induced fluxes will add up or will take refuge.
  • a magnetic support (not shown) placed near the air gap will therefore be influenced by these flows and will be able to record magnetic information.
  • the entire magnetic head is embedded in a material not magnetic and electrically insulating.
  • FIG. 1 only an elementary head has been shown (P1-P2).
  • a matrix head can have several tens of row conductors and several dozen column conductors, and have an elementary head at each crossing point.
  • connection pads such as C01, C02, located on the su2 face of the substrate.
  • the layer magnetic MAG does not cover these connection pads, or holes are provided in the MAG layer to access these areas.
  • connection areas (C01, C02) are interconnected at through the SU substrate to connection pads located on the su1 surface of the substrate.
  • the substrate SU then appears as shown in Figures 2a and 2b.
  • FIG. 2a we see the su2 face of the substrate.
  • the network of row and column conductors is shown where realized the set of magnetic heads.
  • Each line and columns is connected to a connection area such as C01, C02.
  • the ranges M1, M2 are the common ground connections respectively to row conductors and column conductors.
  • FIG. 2b represents the substrate seen from the side of the face su1. AT this face is connected to a printed circuit board Cl. To pads of connection of the face su1 correspond, on this plate, the ranges of connection such as C0'1, C0'2. These connection areas are connected by internal connections to the connection pads of the su2 face.
  • connection pads on both sides of the substrate is not the same, it is necessary to provide a distribution connections inside the substrate.
  • Figures 3a to 3g show an embodiment of such a substrate.
  • Figure 3a shows the substrate in section and highlights that the substrate is a stack of layers. Each layer is crossed by as many connection elements as there are connection pads on a face. To rearrange the layout of the connection pads of a side with respect to the arrangement of the connection pads on the other side, between the different layers, there are internal conductors, such as eyelash, to move the connection pads.
  • Figures 3b to 3g respectively represent the su2 face of the substrate, the interfaces of the different layers of substrate 2 to 8 and the face su1.
  • the substrate is alumina.
  • Each layer has a thickness of approximately 0.25 mm, which leads to a substrate a few millimeters thick (2 mm per example).
  • the production process includes a first phase of production of the substrate by stacking different layers of alumina and production, at each stacking step, of connection elements crossing each layer and conductors (ci1) allowing to move the connection ranges.
  • This substrate being produced with on its face su1 connection pads C0'1, C0'2 and on its face su2 connection pads C01, C02, the set of magnetic heads is produced on the face su2.
  • the conductors' drawing must take into account the constraints imposed by the realization of the magnetic heads: not reduced between conductors (at 80 ⁇ m for example).
  • This establishment also takes into account the constraints imposed by the production of the substrate: typically 250 ⁇ m of pitch between the connection elements passing through the substrate (100 ⁇ m in diameter).
  • the substrate SU is produced in a material with good magnetic permeability, for example ferrite. There is therefore no need to provide the layer of good magnetic permeability MAG.
  • the invention has the advantage of providing a magnetic head compact, integrated, rigid matrix with reliable electrical connections, and less expensive.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Magnetic Heads (AREA)
EP97401601A 1996-07-05 1997-07-04 Matrix-Magnetkopf zur Aufzeichnung/Wiedergabe und Herstellungsverfahren Expired - Lifetime EP0817172B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9608393 1996-07-05
FR9608393A FR2750787B1 (fr) 1996-07-05 1996-07-05 Tete magnetique matricielle d'enregistrement/lecture et procede de realisation

Publications (2)

Publication Number Publication Date
EP0817172A1 true EP0817172A1 (de) 1998-01-07
EP0817172B1 EP0817172B1 (de) 2003-05-02

Family

ID=9493753

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97401601A Expired - Lifetime EP0817172B1 (de) 1996-07-05 1997-07-04 Matrix-Magnetkopf zur Aufzeichnung/Wiedergabe und Herstellungsverfahren

Country Status (6)

Country Link
US (1) US5933940A (de)
EP (1) EP0817172B1 (de)
JP (1) JPH1091917A (de)
KR (1) KR980011052A (de)
DE (1) DE69721397T2 (de)
FR (1) FR2750787B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19852037A1 (de) * 1998-11-11 2000-05-18 Thomson Brandt Gmbh Magnetbandgerät mit Treiberschaltung für Matrixkopf
FR2797514B3 (fr) 1999-08-10 2001-10-12 Thomson Csf Dispositif de lecture magneto-optique pour bandes magnetiques multipistes
US6650496B2 (en) 2001-05-15 2003-11-18 Phs Mems Fully integrated matrix magnetic recording head with independent control

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839784A (en) * 1968-09-30 1974-10-08 Texas Instruments Inc Method for fabricating magnetic read-write head array and product
EP0269489A1 (de) * 1986-10-31 1988-06-01 Commissariat A L'energie Atomique Herstellungsverfahren eines Magnetkopfes zur Vereinfachung der Herstellung von elektrischen Anschlüssen
WO1989000327A1 (en) * 1987-07-01 1989-01-12 Digital Equipment Corporation Solenoidal thin film read/write head for computer mass storage device and method of making same
JPH0581615A (ja) * 1991-09-24 1993-04-02 Sharp Corp 薄膜磁気ヘツドの製造方法
JPH06187612A (ja) * 1992-12-21 1994-07-08 Fujitsu Ltd 磁気ヘッド組立体
EP0616316A1 (de) * 1993-03-15 1994-09-21 International Business Machines Corporation Wandler-Trägeranordnung für ein magnetisches Speichergerät
EP0716410A2 (de) * 1994-11-29 1996-06-12 Thomson-Csf Herstellungsverfahren für Aufzeichnungs-/Wiedergabemagnetkopf und Aufzeichnungs-/Wiedergabekopf

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2680268A1 (fr) * 1991-08-09 1993-02-12 Thomson Csf Tete de lecture magneto-optique.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839784A (en) * 1968-09-30 1974-10-08 Texas Instruments Inc Method for fabricating magnetic read-write head array and product
EP0269489A1 (de) * 1986-10-31 1988-06-01 Commissariat A L'energie Atomique Herstellungsverfahren eines Magnetkopfes zur Vereinfachung der Herstellung von elektrischen Anschlüssen
WO1989000327A1 (en) * 1987-07-01 1989-01-12 Digital Equipment Corporation Solenoidal thin film read/write head for computer mass storage device and method of making same
JPH0581615A (ja) * 1991-09-24 1993-04-02 Sharp Corp 薄膜磁気ヘツドの製造方法
JPH06187612A (ja) * 1992-12-21 1994-07-08 Fujitsu Ltd 磁気ヘッド組立体
EP0616316A1 (de) * 1993-03-15 1994-09-21 International Business Machines Corporation Wandler-Trägeranordnung für ein magnetisches Speichergerät
EP0716410A2 (de) * 1994-11-29 1996-06-12 Thomson-Csf Herstellungsverfahren für Aufzeichnungs-/Wiedergabemagnetkopf und Aufzeichnungs-/Wiedergabekopf

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
LAZZARI J P ET AL: "A NEW THIN FILM HEAD GENERATION IC HEAD", PROCEEDINGS OF THE INTERNATIONAL MAGNETICS CONFERENCE (INTERMAG), WASHINGTON, MAR. 28 - 31, 1989, no. -, 28 March 1989 (1989-03-28), INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages AA01, XP000067167 *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 422 (P - 1586) 5 August 1993 (1993-08-05) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 539 (P - 1812) 13 October 1994 (1994-10-13) *

Also Published As

Publication number Publication date
FR2750787B1 (fr) 1998-11-13
JPH1091917A (ja) 1998-04-10
US5933940A (en) 1999-08-10
DE69721397T2 (de) 2004-04-01
FR2750787A1 (fr) 1998-01-09
EP0817172B1 (de) 2003-05-02
KR980011052A (ko) 1998-04-30
DE69721397D1 (de) 2003-06-05

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